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Finding the Fourth Proportional to 144.21, 215.95 and 71.88

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Solution

The fourth proportional to 144.21, 215.95 and 71.88 is: 107.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.21 : 215.95 = 71.88 : x
  2. Step 2: Convert to fraction form
    144.21/215.95 = 71.88/x
  3. Step 3: Cross multiply
    144.21x = 215.95 × 71.88
  4. Step 4: Simplify right side
    144.21x = 15,521.05
  5. Step 5: Solve for x
    x = 15,521.05/144.21
  6. Step 6: Final answer
    x = 107.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.